Signal plot example fixed (did not show spikes)
Doctest fixed for new spike density estimation
Removed max_spikes arg from inhom. Poisson gen.

Does not make sense here as the resulting spike train will usually have
less spikes.
Fixed a typo.
Allow spike trains longer than 1000 years ...

... even though unlikely it is nicer code, I think.
Merge pull request #1 from jgosmann/feature/failsafeBoundaries

Allow spike trains longer than 1000 years ...
Convolution function for spike trains.

Still needs documentation.
Laplace kernel.
Returns discretization bins in st_convolve.
Use numpy assert function for comparing arrays.
Causal decaying exponential kernel.
Use class instead of kwargs for kernel params.

This will result in cleaner code as it saves us from passing down the
kwargs in addition to the kernel.
Rescale in histogram to be on the save side.
Merge remote-tracking branch 'upstream/develop' into develop
Merge branch 'develop' into feature/stMetrics
Merge remote-tracking branch 'upstream/develop' into develop
Merge branch 'develop' into feature/stMetrics
Restore previous state of rate_estimation.

It might not be a good idea to remove exported/public functions from
a module which might already be used in third party code.
Kernel implementations.
Tests for the kernels.
Setting higher default sampling rate.